RESEARCH COMMONS
LIBRARY

Finite Element Based Stability Constrained Weight Minimization Of Sandwich Composite Ducts For Airship Applications

ResearchCommons/Manakin Repository

Finite Element Based Stability Constrained Weight Minimization Of Sandwich Composite Ducts For Airship Applications

Show full item record

Title: Finite Element Based Stability Constrained Weight Minimization Of Sandwich Composite Ducts For Airship Applications
Author: Khode, Urmi B.
Abstract: High Altitude Long Endurance (HALE) airships are platform of interest due to their persistent observation and persistent communication capabilities. A novel HALE airship design configuration incorporates a composite sandwich propulsive hull duct between the front and the back of the hull for significant drag reduction via blown wake effects. The sandwich composite shell duct is subjected to hull pressure on its outer walls and flow suction on its inner walls which result in in-plane wall compressive stress, which may cause duct buckling. An approach based upon finite element stability analysis combined with a ply layup and foam thickness determination weight minimization search algorithm is utilized. Its goal is to achieve an optimized solution for the configuration of the sandwich composite as a solution to a constrained minimum weight design problem, for which the shell duct remains stable with a prescribed margin of safety under prescribed loading. The stability analysis methodology is first verified by comparing published analytical results for a number of simple cylindrical shell configurations with FEM counterpart solutions obtained using the commercially available code ABAQUS. Results show that the approach is effective in identifying minimum weight composite duct configurations for a number of representative combinations of duct geometry, composite material and foam properties, and propulsive duct applied pressure loading.
URI: http://hdl.handle.net/10106/6132
Date: 2011-10-11

Files in this item

Files Size Format View
Khode_uta_2502M_11178.pdf 1.512Mb PDF View/Open

This item appears in the following Collection(s)

Show full item record

Browse

My Account

Statistics

About Us